I made a list of the weight-reduction bags currently in-game:
http://wiki.project1999.org/index.ph...-reducing_Bags
There's probably a few I missed; if you think of any, please add them to the list.
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If you were just looking for ten-slot bags, not necessarily with a weight-reduction component, you could look at the various caster research books. I think they all have ten slots, and cost around 10pp. I think deluxe toolboxes were Velious-era.